SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '691675c7d93a42587bec78d3b02dc5f7b71b85e3ab98aff0137c69204425ca40' 
  AND token = 'oDskJwkukrIJI+k9F5jg1JcCgyMCuq/KPWvUFylmPrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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