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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fcc60bdf25f9991be38e6e1f51bd1488dd5a309727e54d15b255c1832a55f5c7' 
  AND token = 'NdyMjKzvjenERZahj4gi7mLdEV6b2E0A4rNvv+J1aLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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