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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '116e20bb8f38b4fbf65e0a28062dea1871914c28ecfa81b3738af271b4f3fec8' 
  AND token = 'IyvJv579gC9iy3UoKglluSfaM0/d1PaGXcHeccDWczk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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