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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91eb70693cb754cb17e31caf634ffc599c9805aae69d172489521fcfa1a2ad0c' 
  AND token = '+021vxtW/k2mElX19FsLcfcpHPantYtMSwKocV0Q3Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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