SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8f1766e39fa4d8fc734de75274e52cc250d11432ad90738f3a2fae9b763125bc' 
  AND token = 'SNWyTcjRBR1I1jnX0cywyppqVASYgzGAgK98aiNvYRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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