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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '64b13fdfc6cd80a4a6f98e454aad190d95dc1ca661244b4ef60440a7309334fe' 
  AND token = '7ebQdyNxwTvTyIxzPK6AgprLuBjNCo2TiYeZKrvNkVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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