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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8cc2716440a37bd06f486af54bd3f55347bd098e4ef59d249577a060c3c397f9' 
  AND token = 'TENRIecZYuio2W7XfA81dygD3Y0+jO+4QxAn2FJQ21k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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