SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c88516976f21d4bff24331d65a6e3ad13521bee79c4c5d83cfdd2a6718e56c1' 
  AND token = 'hAOJ1RyUKpPZU0kdF6CXjwOnm7w2vPS+3GbHX8/hkDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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