SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c826da7920849bb0d8f00f81fcacc65686e8aa5bc79613330a999b420b07c153' 
  AND token = 'Gpjos0iRIBCKS9jV3y/GMsjtiq1AENobIvNL3KHW5Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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