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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d7d4e4a9558f238955a636a3956fe0153bcd6eda98ea3f6b8ac18ead2e1a684' 
  AND token = '9x2dSpjxi1J+ZjM7t48H6QTc01tQ4yGxHVcf0qnHOLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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