SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c5344063669811e0008f4cf94265441ffd686575ed8b3255ceb3ac0a375ac65' 
  AND token = 'zZxjWFLvLW1iuYcCAVGlI5jJc4gfaWsgLNm2owKBuEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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