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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9c552635b806ef79a41ae4a43e09db09ad5524e8aaaaf526a97c86820870fd0' 
  AND token = '5/6+smeLRtgNcxtdH1CMIOLKRXnTc47Fk2OKgclI81E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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