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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dfc2cb14bab97ee1dee1334a7a111e5e0c59b21d178cc28e4495d212a87cf208' 
  AND token = 'NM5wulJSuWIzpUm7VcJG6YLOpkSKE2q8vlCkcXtaaFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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