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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '841d0df7297428dca8b7f71f241cdb49bd6afbcf894a55da5c655f0f4d719e9b' 
  AND token = 'tELi0HouYGMo0QfWVxyiAbT6wL0hDnZgnD4+SLG7Rcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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