SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7a06a544c99c19fff29b38a8d8095bedbd31285836aed25b52ee26fdc52d5287' 
  AND token = 'H37k4z3oagCXEQkYsVr0SE7HfCqPuhjX0hpnO1UjSKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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