SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a76cbb6df4ac0da166a770be8d294ba9fc1c99782cc5a16fb6139f36dfc59215' 
  AND token = 'Vr4ioyks3aObO/OxTPxUUF34DBDBKjgjvbYBzf5YQuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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