SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f67ea47005a191932e3ce7f8c20f0a34d3c36a704a2e6db68bfff1b1dbe3658' 
  AND token = 'G+XNUwczyAjkkvR4UfhG2HsV39nv/4+rgcOWwD60lnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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