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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de919a6c7a34e9b3c5f4e7b4a9ec9a8a4c10104a32bde6311bd8e76ddb57981f' 
  AND token = 'iGJPcf6ynTaEo0D7QimhtsQhrq1gohAd2hQJqiZGOEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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