SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a33db405c3ad5f300999b49cfe29dd53ef543b88a03e7dfa527e9432bd487154' 
  AND token = 'V+7BeLteHqF6fSjvMYgmsSRvJv7MDEwm/2ntC0V97vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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