SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e6e3336b9b53f264caaebb2acc847750174419c2745270edfc52bd1895ab6f0' 
  AND token = 'ZM9ILa5s7D7c2xxMVikBGFjX/RC1eg5ph5hqZot1Q2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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