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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c12ad94fabc3dabd6ce9ebb4b9fb702a1a7ea806ca4ea2af27f2adb9ec06b596' 
  AND token = 'DrnF1a5ACx/9xqqsp9m45k7goEYpIa70cbmOI+YuPRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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