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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b360345c7e541d09dcf790dc6e9276a1e4a3c63f0afe16a5e624f1defd48a67' 
  AND token = 'LAE9KF7I/Fv0FwrDIZti4S2oH3M9AbXOqEfducD+bCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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