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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e85dfeec5164256b3adf9253bdf6c508f4d5a9dae6be36d208831a7d7e3d3352' 
  AND token = 'BrnwwWNit1Myl9Q1AiKweIe3f2uRBYk1WCAtGZlOCC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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