SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c03be162534936f419cd49598cf10787647c60753772c396c95d3c522dcfaf2' 
  AND token = 'hg3Oaolw2CQYJ5eoxO0IPXuyQIEgOQ6kmwKIGq+kspY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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