SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e5e9b1b1f82e76f2eab850952c437830f75ac8b046e89bcd82b625de51e7907' 
  AND token = 'AgiHp4fjDYpEVxwYohe4FlfPuR9AV4k3JWknwOGuNH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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