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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20bc5615c99f1a8b3861ae74e3d306669e9ea4049de602e064246c4c79b405cd' 
  AND token = 'VJ4ORJs19EHLB0u6tsq3+DoMRANOTjSTX4tY2HjzNUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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