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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8217cacb55d7fb0cb00977e434c5eecf4c07642ee04e4c8ecfe150802feab568' 
  AND token = 'QAKUkxdK1pINUdWgJv1mohKgpK4POwpM4MQX9c5ldr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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