Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '766e4da5d8e2ca7bda88dc5b7d84515014eebc158a4e63dd78fd6514aa7139e0' 
  AND token = 'xvjS4vG80SVMHSxUeMwq2JqS/GrDS8n1UYIEnjZbGRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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