SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9c2af9b83fed4c1a384685d2f057b865130be15a2eb4f2f7a5c63b2bdae3f70' 
  AND token = 'hwlZVSKMLr9xfYDoaIktbC8uNxPOAV0AhvfGMJVbWRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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