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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad8d00972e8cab2fb7d79208f96e26bcfb765ccc99d17b16ed37d6f6892d39ea' 
  AND token = 'mhwOvLOXeaYlophQuc7mI6U4gFm8t0iQyAdBExNUISs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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