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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '524a50f4ea816471964661035c3e1ab236602e770ce428204a8972838183febc' 
  AND token = 'J9m0UVcjCcOpiaH0n9jfC1Iz6bSW6ZzYeWAY3gMQqF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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