SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8cea456f308bb0d2ba700a66ff7d18178955e244e8f16896b25bb17a15bd388f' 
  AND token = 'T3LcVT4/aqZ09mH3gJtMP46eqo4tLt+5EjwSz+d1yWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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