SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a767b556bc3808e893ce18819a20c94e1ff7c4389463f0e2b5244c6567e59aaa' 
  AND token = 'NVBygJ56H+vi2Ty3Jn1SQU6f1GeKGxnDdh5jXmwOqyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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