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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '523fc9eef0e53e972f6ebf9117940560f8849b4675f84db93f9dec5c835ba376' 
  AND token = 'nVXOonxdetV643qHq4EjVoRV5hV7r+Isu+9dNL/pyzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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