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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd30c21ab9b76b01f18ebf0d4e16f0eccc53e3a82b24c59fcffe55c35c113fb8' 
  AND token = 'IWebQa2Nh5pPyaaCKTJibZd7AILs1gX0OdXRf9MZLuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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