Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0ff75013b77a47ff50a9f7d3a8f0023c0f53964127ca7d1e4ae085297f6c318' 
  AND token = 'WWWpX4Nqi77AWnPYh3zmpj7Fqm164LeWjr1puunW71U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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