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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c5f7e02f14517670d4253c8500b2ddf446e50f9831af895e646584ffd5cd3ef' 
  AND token = 'X/GRRb249fw1Lz5mrKLFiR5n22bzelWzjQCzAuXnw/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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