SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6cca7d772022e5a7f75997a53a8fbcbe1a594f2532e94a7d96ce09d1f7223ad3' 
  AND token = 'QEV2qKLIT7FeFj/Uc+Q+CKQfmkSY3oywBRjheTYFl80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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