SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be5cc9676dc6c923baff8e87c08c4cb0d32a4bb545955e22658ac382a46b2a19' 
  AND token = 'D4jhjg2mGPA+N3tjmjC/EGXSSEO+6JZGH0P7eeOFzz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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