SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '152342a38b6301b4e07adebce573903aa1755443449d67b098349d574625f2c7' 
  AND token = 'ZKcqFVXv1BeBbyUTIlDCaYaeP/blub5HX7G31zMtw88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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