SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '488fe4a38f8333969d5e647a0af1238fcdad36036c4f663390014682554aa312' 
  AND token = 'CAPOniDnw+PXM52lG3QvrEKYgCl0NX3UIOKeuMvQqJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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