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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c58b3589906fc00d3e6fe6f230f6f883a9d38a1ef3d7b1a0b90e3f2126c729ef' 
  AND token = '6p7WoMqFtDiRfnbU4feIYcuXToipSyNBw3anzwG+1b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}