SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb95edc87ee2ebf9b3d8154472b5f79839ac72e32a1d2f24120b55fb4bd909ff' 
  AND token = 'jh6QdYlo1sokV+wPmvLN8vsEOks7XMR3OvzjzgYfy/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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