SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58b19f8eb4745ca43b8f3880d59039412f16943c513111e99ccfc070b22f9b62' 
  AND token = 'x7jTz5wYpzx/E6ewZN0sGOJtWHmdduNeA0eECY/pTGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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