SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa6b3cd23231c44a962aab9d5c94cdc096fde4588a771b58728e85ce5a6b7629' 
  AND token = '8EdP/hL6oufJBB4HHyc0Gy1QR/F0hG744fADYzQCyV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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