SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2068a4b4d6172130597b8c15f76b121ca502e3dd8b33f566606d7656c7712188' 
  AND token = 'Fyh7KFItj0HqjryHI/0w5Lg2DbYB1Yv6v0Tely3CPqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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