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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '196d049107de94216c84e9b8ae588ecbcb1240b2eb41c038b4a35966f1b10717' 
  AND token = 'ppICwwLMD8Oy+731Zs5fc2fUx23ajB6gSfft4KID+iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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