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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b242809db831a36dceba3a1cdb8cd73e73dfb6399e4acb6e5b6dac0307da47e' 
  AND token = 'qj0oSdQjsYXGvlvT3nxyAop7QxpjPQ8PehsK629KNd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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