SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a357f44416828298fc075ecb92a9ab9ebe106071bf7849c1d151e0e7d2f36f27' 
  AND token = 'OyoqCADnx3BkoJ7bN/o54VulWbEGch4Vmvx9J94X5vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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