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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb32cd0e4724537292c7dabfd05b4d01e0d8af1df6fb3ef0885ea7242fa37b9e' 
  AND token = 'XRZm4eSC67ZtRBdytDSPY6cxr3Kb4qYcTaYTJCoX+k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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